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DIGITAL HABITS ACROSS GENERATIONS
A. Today's grandparents are joining their grandchildren on social media, but these two generations' online habits couldn't be more different. (...)

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In which paragraph does the author :
4.1. give an example of a person who decided to limit the time he/she spends online?
4.2. mention the ways in which the youth use their phones?
4.3. quote a senior whose social life changed considerably thanks to social media?
4.4. mention an age group in which social media use has gone up?